ellen gordon reese is author of "can i wear my noise ring to the interview?" >>> why you make some of the same mistakes as your favorite football or baseball star when it comes to money. >>> poppy harlow takes a look inside a mobile cupcake business fueled by social media. >> all right, who's next, who's next? hey there. >> reporter: curbside cupcakes hasn't been around long. washington, d.c.'s, pink cupcake truck developed a following. >> one of those when oun raspberry lemonade. >> reporter: social media savvy is driving success. >> i'm tweeting and facebooking where my nexttop will be. they should be ready for us when we get there. >> reporter: fingers crossed? >> fingers always crossed. i still get nervous every time i go to a new stop. >> we actually were just passing by and saw these guys, but we've been tracking them on facebook. >> this is actually the third time i think it is i've been out here and now i'm addicting, wanting them every day. >> standing in line to get another one. >> reporter: an online cupcake calendar along with constant tweets and f